I would want to know two things Bould
- did the person that gave you your PSA result read it absolutely correctly or could the result sheet actually have said < 0.1 ? You know that the < sign means the world but so many receptionists and practice nurses seem to not know what it means.
- is it possible that this PSA test was done at a different lab or could it be that this time, the nurse only ticked the normal PSA test box rather than request the supersensitive test that you have been having up to now?
If it was same test, same lab, and read correctly, I would be seeking a referral back to the specialist to discuss. Officially, chemical recurrence is when you get to 0.2 or have three successive rises so you are not quite there but you have been down this road once already, haven't you. The difference this time would be no obvious other salvage treatments on the table so the point for acknowledging a possible recurrence is not the same as the point at which long term maintenance treatment might start. Some oncos suggest waiting till the PSA gets to 5 or 10 and some would even wait for it to reach 20.